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In-situ Coating Extrusion2014-08-01

Publishing Venue

The IP.com Prior Art Database

Abstract

Internal liners are used to rehabilitate corroded pipelines. Several pipeline liner products are composed of low-strength thermoplastic materials which are highly corrosion resistant. Existing liner designs insert the liner into a previously fabricated pipeline system. An internal coating of these thermoplastic materials could provide similar levels of corrosion resistance. An in-situ approach would be accomplished through use of a pipeline coating extruder that would be positioned behind the internal line-up clamp assembly, thereby enabling pipeline construction and coating installation activities to occur at the same time. The liner would not be pulled through the pipeline but would rather be extruded at approximately the same rate that the pipeline is being constructed. The internal coating extruder could potentially be located anywhere along the firing line, between the first welding station and the stinger at the aft of the pipe-lay construction vessel. The invention could also be used onshore as part of a mainline welding arrangement.

Country

United States

Language

English (United States)

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This is the abbreviated version, containing approximately
51% of the total text.

ABSTRACT

Internal liners are used to rehabilitate corroded
pipelines. Several pipeline liner
products are composed of low-strength thermoplastic materials which are highly
corrosion resistant. Existing liner
designs insert the liner into a previously fabricated pipeline system. An internal coating of these thermoplastic
materials could provide similar levels of corrosion resistance. An in-situ approach would be accomplished
through use of a pipeline coating extruder that would be positioned behind the
internal line-up clamp assembly, thereby enabling pipeline construction and coating
installation activities to occur at the same time. The liner would not be pulled through the
pipeline but would rather be extruded at approximately the same rate that the
pipeline is being constructed. The
internal coating extruder could potentially be located anywhere along the
firing line, between the first welding station and the stinger at the aft of
the pipe-lay construction vessel. The
invention could also be used onshore as part of a mainline welding
arrangement.

DISCLOSURE

Offshore pipelines require excellent integrity and
reliability in order meet their service lifetime and to avoid the significant
costs associated with subsea repair or rehabilitation. Internal corrosion represents a major
challenge to integrity due to the various corrosive species transmitted within
flowlines, jumpers, and long-distance transmission lines. Various approaches are available to resist
corrosion mechanisms, including material selection, chemical inhibition, and
internal claddings. Internal cladding
using corrosion-resistant alloys, or CRAs, can provide excellent corrosion
resistance albeit at a significant cost outlay.
Non-metallic solutions using thermoplastic liners have become a cost-effective
alternative to CRAs that provide an effective barrier between the steel
pipeline and the corrosive species within.
The most standard deployment method involves pulling, or “slip-lining”,
the polymer liner through the existing pipeline. Originally developed as an
onshore rehabilitation technology, it can also be installed into pipelines
prior to start-up. Recently,
technologies have been developed to install these liners into reeled pipelines
during the initial reeling process so that a fully-lined pipeline is delivered
to the field for installation.
Unfortunately, the method has not been effectively transferred to other
pipeline installation methods, such as S-lay or J-lay installation, that
require offshore welding procedures. The
present disclosure detail...